陕西山阳—柞水矿集区冷水沟矿区构造变形特征及其地质意义
发布时间：2018-09-10 21:16
【摘要】：山阳-柞水矿集区属于中秦岭弧前盆地系,经历了古生代俯冲-增生造山作用和中生代碰撞造山作用,区内构造、岩浆活动强烈,成矿地质条件优越,区内已发现众多斑岩-矽卡岩型矿床。冷水沟铜金矿是近年来发现的斑岩型铜金矿床,具有良好的成矿远景,但研究程度较低。本论文选取山阳-柞水矿集区内的冷水沟斑岩型铜金矿床作为研究对象,主要通过野外调查、节理分期配套、断层几何学、运动学及动力学研究与分析、显微构造分析来重点研究矿区构造样式、构造演化规律及构造与成矿关系,以期对冷水沟矿区外围找矿乃至山阳-柞水地区同类矿床的找矿工作提供参考,本论文取得了如下主要认识:1、“二元”结构:矿区内存在两套呈角度不整合接触的地层,形成了由新元古代基底与晚古生代盖层组成的“二元”结构,指示本区在新元古代至晚古生代经历过挠曲与隆起。元古代基底主要由闪长岩、花岗岩和斜长角闪岩组成,古生代盖层主要由灰岩、粉砂质泥岩、砾岩组成。2、三期断层:断层几何学、运动学、动力学特征观测与分析,结合矿区内节理的分期配套将矿区内断层分为三期:第一期韧性左行剪切断层;第二期北西北东向脆韧性共轭断层;第三期东西向、南北向脆性断层。3、构造与成矿关系:矿区内的铜钼矿化的展布主要受斑岩体控制,而斑岩体则受到早期构造薄弱带控制,如早期的断层与褶皱的核部。矿区内的金矿化受韧性、脆韧性断层控制,其中第二期北西北东向脆韧性共轭断层是最重要的控矿构造,因此,在本矿区内及外围的找矿工作中可对第二期断层重点关注。
[Abstract]:The Shanyang-tussah ore concentration area belongs to the middle Qinling arc front basin system and has experienced the Paleozoic subduction-accretive orogeny and Mesozoic collision orogeny. The tectonic and magmatic activities in the area are strong, and the ore-forming geological conditions are superior. Many porphyry-skarn deposits have been found in the area. Lengshuigou copper and gold deposit is a porphyry copper-gold deposit discovered in recent years. In this paper, the Lengshuigou porphyry copper-gold deposit in Shanyang-tussah ore gathering area is chosen as the research object, which is mainly studied and analyzed by field investigation, joint matching by stages, fault geometry, kinematics and dynamics. The microstructural analysis focuses on the structural style, tectonic evolution law and the relationship between structure and metallogenesis in the ore area, in order to provide a reference for prospecting in the periphery of the Lianggou mining area and in the similar ore deposits in Shanyang-Zhashui area. In this paper, we have obtained the following main understanding: 1, "binary" structure: there are two sets of unconformable strata in the mining area, forming a "binary" structure consisting of the Neoproterozoic basement and the late Paleozoic caprock. It indicates that the area experienced flexure and uplift from Neoproterozoic to late Paleozoic. The Proterozoic basement is mainly composed of diorite, granite and amphibolite, and the Paleozoic caprock is mainly composed of limestone, silty mudstone and conglomerate. The faults in the mining area are divided into three phases: the first stage of the ductile left shear fault; the second phase of the NNW ductile conjugate fault; the third phase of the east-west direction. The relation between structure and mineralization: the distribution of copper-molybdenum mineralization in the ore area is mainly controlled by the porphyry, while the porphyry is controlled by the early tectonic weak zone, such as the core of the early fault and fold. The gold mineralization in the mining area is controlled by ductile and brittle-ductile faults, of which the second phase NNW-trending brittle-ductile conjugate fault is the most important ore-controlling structure.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P613
[Abstract]:The Shanyang-tussah ore concentration area belongs to the middle Qinling arc front basin system and has experienced the Paleozoic subduction-accretive orogeny and Mesozoic collision orogeny. The tectonic and magmatic activities in the area are strong, and the ore-forming geological conditions are superior. Many porphyry-skarn deposits have been found in the area. Lengshuigou copper and gold deposit is a porphyry copper-gold deposit discovered in recent years. In this paper, the Lengshuigou porphyry copper-gold deposit in Shanyang-tussah ore gathering area is chosen as the research object, which is mainly studied and analyzed by field investigation, joint matching by stages, fault geometry, kinematics and dynamics. The microstructural analysis focuses on the structural style, tectonic evolution law and the relationship between structure and metallogenesis in the ore area, in order to provide a reference for prospecting in the periphery of the Lianggou mining area and in the similar ore deposits in Shanyang-Zhashui area. In this paper, we have obtained the following main understanding: 1, "binary" structure: there are two sets of unconformable strata in the mining area, forming a "binary" structure consisting of the Neoproterozoic basement and the late Paleozoic caprock. It indicates that the area experienced flexure and uplift from Neoproterozoic to late Paleozoic. The Proterozoic basement is mainly composed of diorite, granite and amphibolite, and the Paleozoic caprock is mainly composed of limestone, silty mudstone and conglomerate. The faults in the mining area are divided into three phases: the first stage of the ductile left shear fault; the second phase of the NNW ductile conjugate fault; the third phase of the east-west direction. The relation between structure and mineralization: the distribution of copper-molybdenum mineralization in the ore area is mainly controlled by the porphyry, while the porphyry is controlled by the early tectonic weak zone, such as the core of the early fault and fold. The gold mineralization in the mining area is controlled by ductile and brittle-ductile faults, of which the second phase NNW-trending brittle-ductile conjugate fault is the most important ore-controlling structure.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P613
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本文编号：2235633
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